From ADV:
When inventor Kyusaku Natsume transfers the brain of his son Ryunosuke's cat into a top secret android body, he doesn't lose a family pet...he gains a daughter! Nuku Nuku may appear to be a teenage girl, but her cute and cuddly exterior hides both the superhuman strength of the world's most advanced android chassis and the lightning quick senses of a domestic feline. She’ll become the s...

From Obsession:
Serge Battour, son of a gypsy prostitute and a count arrives to the Lacomblade academy, wanting to follow his father's footsteps and become a famous pianist. In this place he meets a strange boy, Gilbert Cocteau. Gilbert is well known because of his promiscuity and evil behaviour, but this doesn't stop Serge trying to be friends with him and maybe something more... Can you hear th...

From Fifay.net:
At the end of the Sui Dynasty (581AD - 618AD), the oppression from the Imperial Court threw China into chaos as rebellions erupted all over the country. Duke of Tang, Li Yuan, decides to return to his hometown Taiyuan in order to avoid the dangerous political games. Meanwhile, a young priestess prophesizes a white dragon--the symbol of rulers--for the Li family. She keeps a close ...

From Ivyscan:
In 1875, after the death of her parents, Uno goes to live in the Kanou household as a companion to Mariko, who is the same age as Uno. The two girls become very close and attend Cimons private school.
This great romance tells the story of the loves and dreams of two girls growing up during the westernization of Japan in the Meiji era.

A collection of oneshots.
Impossibility only scanlated the first volume.
1. ABC
Aki is in her first relationship with Yousuke, but he doesn't seem like such a great guy...
2. Nako's Love Letter
Suki's boyfriend, Tooya, is scary looking and always treats her like his servant. How does he really feel?
3. Snow Upon You, Flowers On My Heart
Yu has been asked to take care of his cousin, ...

Thirteen year-old Sanada Beni is part of a ninja family. After years of training, she is finally a Red ninja. She takes an oath of loyalty to fulfill all her missions as her family's "red ninja" descendant.
She sets off to the same school attended by Kiyoshi Makoto, a boy she accidentally met four years ago. Now, what will happen as Makoto continues to protect the entrance ceremony - ...

Asako lives her life day-to-day acutely aware of how lonely she is. That all starts to change when she meets Hongo, a boy who thought she was trying to commit suicide and tried to stop her. They form a bond and find how much fun life really is. Until Asako finds out about Hongo's past.
Source: Baka-Updates
Includes two other stories once called Cuckoo's Child and another called 60 days.

A collection of two stories:
I. Pinky Mist (summary below).
II.. My Lucky Star.
From Sugar Oasis:
Fen Hong is just an ordinary girl, and like many other girls of her age, her idol is Mist Boy, a famous eighteen year-old singer.
When she hears that her dad will stay in Singapore for two years and leave her in Taiwan, she's unbelievably happy. To her disappointment, it turns out that sh...

From Aerandria:
Our heroine is a girl who was born with magical power, and can give that power to magic users, since magic users don’t have power on their own. But her teacher sealed her power with a ring and a bracelet. She’s traveling to a sacred temple in order to take off the ring and the bracelet, and on the way, she meets two magic users who saves her from those who attempt to steal her mon...

In the mountains of North Carolina lies a mansion named Windsong Place. Ryan, the heir to the mansion, and Sunny, the housekeeper's granddaughter, fall in love and marry. However, Ryan's father, angry at his son's marriage to a girl far below his status, disinherits Ryan and sells off the mansion. Soon after, their marriage deteriorates and Ryan and Sunny go their separate ways... 10 years later, ...

In the village of Adatt, [Iremi], the tomboy granddaughter of a local witch, sees the infamous mage [Edermask] en route to her hometown. Wanting to find out who is stronger, she sets off to challenge him with her childhood friend [Enzu], a novice swordsman who is always being dragged around wherever she goes… However in the background there is a war going on between the two powerful nations Teodor...

Contains three stories.
1) Pink Prisoner -
Hazuki Mayu is the granddaughter of Hazuki Ichinosuke, founder of the Hazuki-style Sword Arts. Four years ago, she debuted as a child star in a children-oriented TV program, but Mayu had a bad experience as a direct result of that and has steered clear of the world of entertainment ever since. But then she receives a request from movie director Iwasaw...

Mizuki Kaname is left speechless when a gorgeous person confesses to him amidst his friends, loitering by a convenience store. He falls at first sight, only to realize right afterward that Tokume Kaoru was a boy. From the beginning, this misunderstanding leads to bittersweet insecurities...
A sad, sweet boys' love story.

Jun's family used to be wealthy, but after his father's death their company went bankrupt and his mother was hospitalized due to too much stress. Now, Jun lives at the home of their former gardener and attends a public school with the gardener's son Koutarou. Unfortunately, Jun and Koutarou just can't seem to get along...

A boy swordsman, Yoichi and his father stays in mountain training for his descent from the mountain. Yoichi comes to the city to lodge and stay with 4 beautiful sisters. A new more severe "training" regiment awaits him.
From Wiki:
After learning martial arts in the mountains for 17 years under his father's teachings, Yoichi Karasuma's father orders Yoichi to continue his training to ...

That's one funky dude, Goemon Ishikawa, the legendary king of thieves from the feudal era has come to know that there's an important treasure being transported from the imperial palace to the Kamiyama mansion, an ancient artifact called "The moon's melody box"
surprised by the extreme measures taken by the guards of this treasure, his indomitable spirit aches to steal this rare item tha...

Included in this collection of manga oneshots is "Dangerous Love Triangle".
Prequel: Kiss Me Baby
Ayase, a high school student catches her chemistry Fugiki teacher whom she is secretly in love with, kissing a married teacher in the music room. Fugiki catches her watching, and after she teases him the two share a kiss. After this however Fugiki ignores her! What are Fugiki's real fe...

From etc:
Based on historical setting of Korea during the Josun Age. Long ago, in Jushin, secret royal inspectors named "Angyo Onshi" wandered the country and restored the order. But now that Jushin is destroyed, only one is still wandering...

From ilovemanhwa.com:
**Funny school adventure of a monk with a secret mission from Tibet!**
Even the oracle, that locates Dalai Lama's reincarnation, would not foresee that the troublemaker Dang is taking the mission to find it. However, Dang's power is yet hidden; his fatal nature explodes chi by sexual impulse and turns him into a monster! Not knowing this, Dang enters Mouhyuk High; follo...

Tsukasa Endou, who has moved to a new school and rumors start to fly about her…she meets the prince of the school, only to find out he is not what he seems to be…One mishap on her part and she is now his slave..will they ever be friends or will they end up killing one another..read to find out!!

From Viz:
This sophisticated collection of tales, ranging from the macabre to heartwarming to wacky, will please any Takahashi fan, as well as introduce the uninitiated to the broad range of the manga master's work! The trials and tribulations of daily life are infused with Takahashi's unique brand of magical realism!